We started with squirting a large amount of white glue onto a paper plate. Next, V put the string pieces in the white glue, covering them completely.
We allowed the rolls to dry overnight--but I think they would be dry enough after a couple of hours. V then poured the paint onto the other paper plate, mixing the paint to blend the colors.
We rolled the roll into the paint and used a paintbrush to further cover it with paint. We then rolled it onto the canvas. V is a little funny about messy hands so for our first attempt I attached clothespins to each side for her to use to roll on the canvas.
The clothespins worked well enough, but, after I showed her how to roll with her hands, that became our way of transferring the paint to the canvas. And after a few rolls on the canvas, her messy hands didn't bother her that much.